MANAGEMENT OF A CONCURRENT OUTBREAK OF NEWCASTLE DISEASE AND KLEBSIELLA INFECTION IN 70-WEEK-OLD BROWN LAYERS: A CLINICAL CASE REPORT
DOI:
https://doi.org/10.33003/jaat.2025.1103.06Keywords:
Infectious bronchitis virus,, Arbor Acre,, Breeder flock,, Colibacillosis,, Vaccine failure,, Poultry healthAbstract
A concurrent outbreak of Newcastle Disease (ND) and Klebsiella planticola infection was investigated in a flock of 70-week-old brown layers (n=6,000) raised on deep litter. The farm reported reduced egg production, anorexia, and increased mortality rate, peaking at approximately 0.67% per day (40/6,000). Post-mortem findings included necrosis of caecal tonsils, petechial hemorrhages at the proventricular -gizzard junction, lineal hemorrhages at the colorectal mucosa, and marked hemorrhages on the duodenal mucosa. Other lesions included soft-shelled eggs in the oviduct, pericarditis, and peritonitis. Histopathology revealed severe pulmonary edema, renal hemorrhages, and lymphoid depletion in the spleen. Klebsiella planticola was isolated and identified through biochemical tests. It also showed susceptibility to enrofloxacin, which was administered. Mortality dropped significantly, with zero deaths by the fourth day of treatment. A booster dose of ND live Lasota vaccine raised protective ND antibody titers from 43.8% to 100% post-vaccination. Recommendations included strict biosecurity, routine water sanitation, and proper vaccination protocols to prevent future outbreaks.
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